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Posts posted by chrisw

  1. In my dream world, this would be an option available after the Pause command. Suppose you come home and notice the printer had some issue half way through a print. The printer's still going through the motions, however no extrusion has been happening for the last 100 layers.

    No worries... just hit Pause, get the issue sorted out, then choose the Continue from layer # _ _ _ option, and rotate the UM2 wheel to choose the appropriate layer. the Z-axis would respond as the wheel is rotated, so you can figure out how far back you need to go.

    This literally was a dream option because I was recently overseas, using a more portable printer during my travels, and dealing with underextrusion issues. I would wake up, jump to hit Pause as soon as the clicking of a filament slippage occurred, fix the issue, then resume and get back to sleep. If I slept through that noise, then the whole print would need a restart.



    • Like 4

  2. Availability is a big issue. Last time I checked:

    UMO+ = 2 months

    UM2 = 2 weeks

    I've been happy with my UM2. Recently I realized just how easy things have been with my UM2, because I purchased a travel-friendly 3D printer kit from another company. The build part was easy, but with this new small printer I lack the ease of use that I came to expect from Ultimaker. For example, the software apps for my new kit hasn't been tailored to suit that printer. There are many settings that I need to experiment with, need look up the correct values for, etc. It requires a lot of fiddling to make it work well.

    Back to the actual subject though.. UMO vs UM2... unless the delivery times are now near equal, I'd go with a UM2 just because you'll be able to use it this quarter.


  3. I'm only 2 months into 3D printing, so I'm still learning lots per day. One thing that seems confusing to me in Cura is print speed.

    It's measured in mm of travel of the nozzle per second, if i understand that part correctly. However, the amount of filament getting pushed through the .4 mm nozzle seems like it would be better represented by a volume measurement. If I can print at 50 mm/s at .06 layer height, that doesn't mean I'll be able to do the same at .1 layer height.

    I didn't realize that point when I first opened the UM2, read the manual, and started printing. In the Cura manual there's a statement explaining print speed, however I think it's leaving out some important data about the association of layer height to nozzle travel speed. The manual states:

    "Basic Settings: Print Speed

    Print speed sets the speed at which the print is put down. The default of 50mm per second is a bit low for an Ultimaker. But this is a safe starting point. People have printed up to speeds of 120mm per second. But this requires a well calibrated and tuned machine."

    What was the layer height and the material used for the 120mm/s speed?

    Maybe a useful feature in Cura could be to choose between using either a Print Speed setting, or a Material Volume per second speed. If I were to set the ideal flow rate for a particular material, and I kept using that material, then it seems I could adjust the layer height, and it would print just as well at all layer heights. The nozzle travel speed would be automatically adjusted inside Cura.

    Or was that idea visited and tossed out long ago in the world of 3DP? Or am I completely off track and missing something about the speed calculations?



  4. paul had me introduced to alibre, but the engine is so so terrible that making something complex is borderline crashing it... all those engine parts they show in the demos? pure miracle that they got them working.

    now that 3dsystems bought them and rebranded them to geomagic, I don't see how alibre will ever be improved.


    Agreed. I bought Geomagic Design (Alibre) a couple months ago because it was affordable compared to many other options, and it appeared to be robust. Going through their tutorials instilled confidence in me... it appeared Geomagic would let me create whatever I'd need. Then I started getting a little more competent at 3D design, so my drawings started getting more complex. That's when the frequent crashes began. Oh well, now I save often.


  5. If you haven't already, I'd suggest trying a different SD card. My UM2 had an issue one day where it was printing about 1 cm worth of layers, then it would bring the bed back up to layer 1 level, and continue printing. so the print would be in 1cm slices, with earlier slices knocked onto the floor. A new card solved that... maybe the original one got corrupted when I pulled it out of the computer without ejecting it in Cura first.

    In any case, good luck... I hope you get your UM2 working well. I've been very happy with mine so far. The prints I've been making at home are better than those I was paying $$$ for remotely.



  6. Disclaimer: I'm new to Cura and 3DP in general, just playing with Cura while I'm waiting for my UM2 to arrive.

    I'm using Cura 14.09 and it seems like I'm having a similar experience. I have a few overhangs on my item, and supports are being built beneath the overhangs, but they appear to stop about 1 CM below the overhangs. I've changed various settings in the Expert Config, but none of the changes seem to make the supports go where I want them to go.

    Any suggestions on a change I should make that I've been overlooking?



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